Nonlinear: "Of or relating to a device whose behavior is described by a set of nonlinear equations and whose output is not proportional to its input." -The American Heritage® Dictionary of the English Language, Fourth Edition
S-parameters have been used to represent linear networks for simulation and design since the 1960s. Measuring S-parameters was made possible with the introduction of the network analyzer. Designers could then integrate S-parameter "black-boxes" along with other electrical components using linear frequency-domain simulators. The measure, model and simulate triumvirate has...
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